no. 1808. RECENT AFRICAN CRINOIDS— CLARE. 33 



anil finely spinous distal edges, especially along the thin ventral distal 

 border; P 3 3 mm. long, much smaller and weaker and much less stiff 

 than Pj, with ten segments; following pinnules similar, slowly becom- 

 ing longer and more slender, the component segments slowly increas- 

 ing in length; distal pinnules very slender, 5 mm. long. 



The color is light pinkish narrowly and sparsely banded with deep 

 purple, or entirely deep purple. 



Locality. — Bagamoyo, German East Africa. 



DECAMETRA ALAUD^E, new species. 



Description. — Cirri XV, 26, small and slender, all the segments 

 subequal, about twice as broad as long. 



Ten arms, 90 mm. long resembling those of D. taprobanes, to which 

 this species appears to be most closely related. 



P a absent; P x slender and flagellate, 8 mm. long with 21 squarish 

 segments; P 2 much larger, stouter, and stiffer, 11 mm. long, tapering 

 very gradually, with 16 segments, the fifth-seventh half again as 

 long as broad, the remainder squarish or broader than long; from 

 the fourth outward the segments have projecting distal edges and 

 distal angles so that the pinnule as a whole reminds one strongly 

 of P 3 in the genus Cenometra; P 3 is similar to P 2 but smaller and 

 much more slender and flagellate distally, 10 mm. long, with 19 

 segments; P 4 and the following pinnules are 6 mm. long, small, 

 weak, and slender; the distal pinnules are very slender, 10 mm. 

 long. 



Locality. — Cargados Carajos; the type, which is in the British 

 Museum, was collected by Prof. J. Stanley Gardiner on the Sea Lark 

 expedition. Another specimen from the same locality is probably 

 referable to this species, though P 2 is more slender. 



Depth. — 30 fathoms. 



Genus OLIGOMETRA A. H. Clark. 

 OLIGOMETRA SERRIPINNA, var. OCCIDENTALS, new variety. 



Antedon scrripinna P. H. Carpenter, Notes from the Leyden Museum, vol. 3, 

 1881, p. 182.— Hartlaub, Nova Acta Acad. German., vol. 58, 1891, No. 1, 

 p. 82, pi. 5, fig. 48. 

 Oligometra serripinna A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, 

 p. 126. 

 Locality. — Mauritius; Cargados Carajos. 

 Depth. — Littoral, and down to 30 fathoms. 



Remarks. — The single specimen before me from Mauritius has the 

 arms about 55 mm. long and the cirri XVI, 17, 9 mm. long. P 2 is 

 7 mm. long, with about fifteen segments. 



The lower pinnules of this specimen exhibit almost none of the 

 peculiar expansion of the distal ends of the segments from which this 

 species gets its name, there being merely a small process ending in a 

 80796°— Proc.N.M.vol.40— 11 3 



